EP1285237B1 - Electrical leakage diagnostics in a magnetic flow meter - Google Patents
Electrical leakage diagnostics in a magnetic flow meter Download PDFInfo
- Publication number
- EP1285237B1 EP1285237B1 EP01944630A EP01944630A EP1285237B1 EP 1285237 B1 EP1285237 B1 EP 1285237B1 EP 01944630 A EP01944630 A EP 01944630A EP 01944630 A EP01944630 A EP 01944630A EP 1285237 B1 EP1285237 B1 EP 1285237B1
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- European Patent Office
- Prior art keywords
- diagnostic
- electrode
- circuit
- leakage
- output
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
- G01D3/032—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure affecting incoming signal, e.g. by averaging; gating undesired signals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
- G01D3/036—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure on measuring arrangements themselves
- G01D3/0365—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure on measuring arrangements themselves the undesired influence being measured using a separate sensor, which produces an influence related signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
- G01F1/60—Circuits therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
Definitions
- the present invention relates to magnetic flow meters that sense liquids flowing in industrial process plants.
- the present invention relates to electrode circuits in such magnetic flow meters.
- Electrode leakage from the electrodes or electrode wiring can give rise to measurement errors in the transmitter output that can go undiagnosed by the operator of the process plant for long periods of time.
- One technique to address the problem of electrical leakage is to attempt to limit errors due to the electrical leakage. For example, a transmitter circuit with an extremely high input impedance is used to sense the EMF. The wiring between the electrodes and the transmitter is also carefully insulated to avoid leakage or extraneous noise. However, these techniques do not attempt to diagnose or quantify the electrical leakage.
- the present invention provides a magnetic flow meter according to Claim 1.
- the present invention further provides a computer readable medium according to Claim 9.
- the present invention still further provides a process for operating a magnetic flow transmitter, according to Claim 11.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Electromagnetism (AREA)
- Measuring Volume Flow (AREA)
Description
- The present invention relates to magnetic flow meters that sense liquids flowing in industrial process plants. In particular, the present invention relates to electrode circuits in such magnetic flow meters.
- Magnetic flow meters utilize an insulated flowtube that carries liquid flowing past an electromagnet and electrodes. The electrodes are sealed in the flowtube to make contact with the flowing liquid. The electrodes sense an electromotive force (EMF) magnetically induced in the liquid, and proportional to flow rate according to Faraday's law of electromagnetic induction.
- Electrical leakage from the electrodes or electrode wiring can give rise to measurement errors in the transmitter output that can go undiagnosed by the operator of the process plant for long periods of time. One technique to address the problem of electrical leakage is to attempt to limit errors due to the electrical leakage. For example, a transmitter circuit with an extremely high input impedance is used to sense the EMF. The wiring between the electrodes and the transmitter is also carefully insulated to avoid leakage or extraneous noise. However, these techniques do not attempt to diagnose or quantify the electrical leakage.
- Another problem affecting magnetic flow meters is the fouling of electrodes, i.e. the accumulation of insulating material on the electrodes. Such fouling causes the resistance between the electrodes and ground (via the liquid) to increase dramatically and this condition can be mistaken for the flowtube being empty. US 6,014,902 discloses a magnetic flow meter that uses a variable resistor network to trigger an oscillating output signal that may be varied to differentiate between an empty flowtube and fouled electrodes.
- The present invention provides a magnetic flow meter according to
Claim 1. The present invention further provides a computer readable medium according to Claim 9. The present invention still further provides a process for operating a magnetic flow transmitter, according to Claim 11. - A magnetic flow meter is disclosed that includes a diagnostic circuit indicating a presence of electrical leakage in an electrode circuit in the magnetic flow meter. The diagnostic circuit couples to first and second electrodes in the flowtube and to the flowtube ground. The diagnostic circuit senses a first diagnostic potential between the first electrode and ground, and senses a second diagnostic potential between the second electrode and ground.
- The diagnostic circuit generates a diagnostic output as a function of a sum of the first and second diagnostic potentials. The sum of the potentials indicates whether there is electrical leakage.
- The flowtube includes an insulated tube adapted to carry a flowing liquid that is coupled to the ground. The flowtube also includes an electromagnet.
- A transmitter circuit couples to the electromagnet, the first and second electrodes and the ground. The transmitter circuit generates a transmitter output representing a flow rate of the liquid as a function of a differential potential between the first and second electrodes.
- The diagnostic output indicates whether the accuracy of the transmitter output is affected by leakage so that corrective action can be taken.
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- FIG. 1 illustrates a magnetic flow meter;
- FIG. 2 illustrates leakage between an electrode circuit and an electromagnet in an magnetic flow meter;
- FIG. 3 illustrates leakage between an electrode and ground in a magnetic flow meter;
- FIG. 4 illustrates a first embodiment of a magnetic flow meter with a diagnostic circuit;
- FIG. 5 illustrates a second embodiment of a magnetic flow meter with a diagnostic circuit;
- FIG. 6 illustrates a sampled waveform of a differential electrode signal under normal and leakage conditions;
- FIG. 7 illustrates a sampled waveform of a summed (common mode) electrode signal under normal and leakage conditions;
- FIG. 8 illustrates a transmitter output (flow) signal and a summed electrode signal during a transition from normal to leaking conditions;
- FIG. 9 illustrates correction of a transmitter output (flow) signal during a transition from normal to leaking conditions in the flowtube;
- FIG. 10 illustrates a third embodiment of a magnetic flow meter with a diagnostic circuit; and
- FIG. 11 is a flow chart of a diagnostic process.
- A magnetic flow transmitter is disclosed in which a diagnostic circuit detects undesired excessive electrical leakage in an electrode circuit of a magnetic flow tube. The electrical leakage is often the result of process liquid leaking past a damaged seal around one of the magnetic flow meter electrodes. The electrical leakage can reduce the accuracy of the transmitter output. The diagnostic circuit senses electrode-to-ground diagnostic potentials at each of two electrodes and forms a sum of the two diagnostic potentials. The sum of the diagnostic potentials indicates whether there is excessive leakage in the flow meter electrode circuit. When leakage is detected with the diagnostic circuit, corrective action can be taken by the process plant operator or by a correction circuit in the transmitter.
- Use of the diagnostic circuit avoids a situation where the magnetic flow transmitter output appears to be indicating flow accurately, but actually is inaccurate due to undetected leakage in the electrode circuit.
- In FIG. 1, a partially cutaway view of an embodiment of a
magnetic flow meter 20 is illustrated.Magnetic flow meter 20 includes aflowtube 22 formed of low magnetic permeability material with an electrically insulatingliner 23, anelectromagnet 24 withcoils 26, a ferromagnetic core orshield 28 andelectrodes electromagnet 24 and theelectrodes transmitter circuit 34. In operation, thetransmitter circuit 34 drives theelectromagnet 24 with an electrical current, and theelectromagnet 24 produces amagnetic field 36 indicated by arrows inside theflowtube 22.Process liquid 21 flows through the magnetic field in theflowtube 22, and the flow induces an electromotive force (EMF, voltage) in theliquid 21. Theinsulating liner 23 prevents leakage of the EMF from theliquid 21 to themetal flowtube 22. Theelectrodes liquid 21 and pick up or sense the EMF which, according to Faraday's law, is proportional to the flow rate of theliquid 21 in theflow tube 22. - The EMF from
electrodes transmitter circuit 34 byleads 38 that are insulated to avoid leakage. Thetransmitter circuit 34 has an electrode input circuit with high input impedance to limit leakage as well. - The
electrodes insulating liner 23, however, with aging, wear or corrosion damage, the seal between theelectrodes insulating liner 23 can be broken.Process liquid 21 can seep past the broken seal and can form electrical leakage paths from the electrode circuit to theflowtube 22 which is grounded. Liquid leakage can also form electrical leakage paths from the electrode leads 28 to theelectromagnet 24. In most instances, theflowtube 20 or thetransmitter 34 includes terminal blocks (not shown in FIG. 1) for connecting electrode leads 38. These terminal blocks can become contaminated with liquid that also forms leakage paths from the electrode wiring to ground or to the drive circuit for theelectromagnet 24. - In FIG. 2, a partial cross-sectional view of an embodiment of a
flowtube 50 is illustrated. Flowtube 50 includeselectromagnet coils leads terminal block 62. Aflowtube 64 lined with aninsulating liner 66 is filled with a flowing process liquid 68.Electrodes liner 66.Electrodes flowtube 64 to prevent electrical leakage. Electrode leads 74, 76 are insulated and shielded and connect theelectrodes terminal block 62. A cable (not shown) connects the leads atterminal block 62 to electronic transmitter circuitry which is explained in more detail below. When the seal betweenelectrode 72 andliner 66 is damaged or broken, process liquid 68 can leak past the seal as illustrated bydots 80 and run or condense in various locations on theelectrode 72, the electrode leads 74,76, or the electromagnet coils 52, 54. The leaked process liquid forms undesired electrical leakage paths from theelectrode 72, electrode lead 76 (i.e., the electrode circuit) to the grounded flowtube 64 or to the electromagnet coils 52, 54. - In FIG. 3, an enlarged partial cross-sectional view of an
electrode 90 illustrates the liquid leakage in more detail.Electrode 90 is mounted in aflowtube 92 that has an insulatingliner 94.Electrode 90 has a shaft with a threadedportion 96 that engages anut 98.Nut 98 is advanced on the threaded portion to compress a spring washer 100 ("Belleville spring") against ametal thrust washer 102.Thrust washer 102, in turn, presses against insulating bushing 104 which presses against theflowtube 92. The force from the compression of thespring washer 100 causes the sharpouter rim 106 of theelectrode 90 to sink into the insulatingliner 94 and form a liquid seal. The liquid seal thus formed is generally reliable, however, with aging, misuse, corrosion, etc. the seal can eventually fail, allowingprocess liquid 108, represented by dots, to seep past the failed seal and complete anelectrical leakage path 110 from theelectrode 90 to the groundedflowtube 92. Thisleakage path 110 loads the flow-induced EMF and causes a flow measurement error, however, this error is often not noticeable by an operator of a process plant for a long time. - In FIG. 4, an embodiment of a
magnetic flow meter 120 is illustrated.Magnetic flow meter 120 includes adiagnostic circuit 122 which can sense electrical leakage and provide anindication 164 to the operator when leakage occurs. The electrical leakage is usually caused by liquid leakage as illustrated in FIGS. 2-3. Themagnetic flow meter 120 includes aflowtube 124 that has an insulated tube orliner 126 adapted to carry a flowing liquid 128 that is coupled to aground 130. The coupling of the liquid 128 to ground is usually completed by way of contact between the liquid 128 and metal piping mating with the flowmeter. Theflowtube 124 has anelectromagnet 132 mounted on it.Electromagnet 132 includescoils 134 and a magnetic return path or core, illustrated schematically at 136. First andsecond electrodes electrode circuit 146. - The
electrode circuit 146 can also includeamplifiers Amplifiers amplifiers amplifiers amplifiers flowtube 124 or mounted in the transmitter housing, depending on the needs of the application. The amplifiers provide a low leakage sensing input for theelectrode circuit 146, and may be seen as part of the electrode circuit. Theelectrode circuit 146 may also be shielded with driven shields (not illustrated) that are driven by the outputs of theamplifiers - A
transmitter circuit 152, which can be of conventional design, couples to theelectromagnet 132, to the electrode circuit 146 (by way of buffers oramplifiers 148, 150) and to theground 130. Thetransmitter circuit 152 generates atransmitter output 154 representing a flow rate of the liquid 128 as a function of a differential potential on theelectrode circuit 146. Intransmitter circuit 152, the outputs ofamplifiers transmitter circuit 152 using an analog differential amplifier or various known types of digital signal processing circuits that compute a difference or subtraction. - The
diagnostic circuit 122 is also coupled to the electrode circuit 146 (viabuffer amplifiers 148, 150) and to theground 130. Thediagnostic circuit 122 senses a firstdiagnostic potential 160 between thefirst electrode 138 andground 130. Thediagnostic circuit 122 also senses a seconddiagnostic potential 162 between thesecond electrode 140 andground 130. Thediagnostic circuit 122 generates adiagnostic output 164 that indicates leakage from theelectrode circuit 146 as a function of a sum of the first and seconddiagnostic potentials diagnostic potentials ground 130. Comparison of thediagnostic potentials ground 130 is centered or balanced relative to the electrode potentials. If the ground is not centered or balanced, then electrode leakage can be inferred. - When the
electrode circuit 146 is free of leakage, it is found that the flow-induced EMF on each electrode relative to ground (diagnostic potentials) tend to be balanced or equal, but of opposite polarity. When these twodiagnostic potentials - When there is leakage, however, it is found that the
diagnostic potentials - When the sum of the diagnostic potentials is imbalanced but approximately in the range of the normal differential flow-induced EMF, then the leakage can be inferred to be a leakage from some part of the electrode circuit to ground.
- When the sum of the diagnostic potentials is imbalanced and much larger than the normal range of differential flow induced EMF, then the leakage can be inferred to be leakage from some part of the electrode circuit to some part of the much higher voltage electromagnet and its associated wiring.
- The
diagnostic output 164 can be arranged to indicate electrode-to-ground leakage when the sum of diagnostic potentials is in a first, lower range, and indicates electrode-to-electromagnet leakage when the sum of diagnostic potentials is in a second, higher range, that is larger than the first range. This is explained in more detail below in connection with FIG. 11. - Typically, the
transmitter output 154 will be a 4-20 mA analog signal, and thediagnostic output 164 will be a HART protocol signal superimposed on the 4-20 mA analog loop signal. - In one preferred embodiment, the
transmitter circuit 152 provides an approximately square wave drive or excitation current toelectromagnet 132, and the corresponding electrode potentials are also approximately square waves, including "flat" time intervals when the flow induced EMF is flat or stable. In this preferred embodiment, the diagnostic potentials are sampled during the time intervals when the flow-induced EMF is flat or stable. Thediagnostic circuit 122 calculates a sampled sum that is sampled in synchronization with the drive to theelectromagnet 132, ensuring that sampling is done during a stable interval. The sampled sum alternates along with the drive, and the diagnostic circuit also preferably calculates an absolute value of the sampled sum to remove this alternation. - In FIG. 5, a second embodiment of a
magnetic flow meter 180 with adiagnostic circuit 182 is illustrated. Themagnetic flow meter 180 shown in FIG. 5 is similar to themagnetic flow meter 120 shown in FIG. 4 and the same or similar parts in FIGS. 4 and 5 are identified using the same reference numerals.Diagnostic circuit 182 includes anadder 186, asampling circuit 188 and an absolutevalue calculating circuit 190. Thesampling circuit 188 is synchronized bysynchronization line 192 so that diagnostic potentials are obtained during a flat or stable portion of the electromagnet pulsed or square wave drive. -
Magnetic flow meter 180 also includes acorrection circuit 184. Thecorrection circuit 184 generates a correctedtransmitter output 194 as a function of a transmitter output 196 (that is not corrected for leakage) and thediagnostic output 198. Thecorrection circuit 184 scales the correctedtransmitter output 194 as a function of a ratio of thediagnostic output 198 to the uncorrected transmitter output 196) when the diagnostic output is in a first or lower range. In this first or lower range, the sum of the diagnostic potentials is low enough to indicate that the leakage detected is leakage to ground, which can be estimated and corrected. Preferably, the transmitter output is corrected according to the equation:
where CM is one half of the sum of the diagnostic potentials, and DM is the differential potential. - The
diagnostic output 198 can also be coupled outside thetransmitter 180 for use by a technician or operator. - FIG. 6 is a display image of digitally sampled waveforms of differential electrode signal under normal and leakage-to-ground conditions. The waveforms of normal and leakage conditions are superimposed on the same display to provide convenient comparison of the two waveforms. The
vertical axis 200 represents differential flow signal amplitude expressed in normalized counts of an A/D converter in a digital sampling oscilloscope. Thehorizontal axis 202 represents elapsed time expressed as sample numbers. Afirst waveform 204 illustrates a normal differential electrode signal waveform under test conditions of approximately 10 foot per second (3.05 metres per second) liquid flow rate and an approximately square wave electromagnet drive at a frequency of about 6 Hertz. The peak-to-peak amplitude between level or stable portions of thisnormal waveform 204 is approximately 40,000 counts peak-to-peak. Next, one of the electrodes is sprayed with water to create a leakage to ground condition, and asecond waveform 206 is sampled under this leakage to ground condition. The second waveform has a peak-to-peak amplitude between level portions of about 24,000 counts. In other words, when one electrode has a leakage to ground, the amplitude of the differential electrode has a error of approximately 15%. Thedifferential waveform 206, however, appears normal in other respects and gives no hint to the operator that the flow meter is malfunctioning due to leakage. - FIG. 7 is a display image of superimposed, digitally sampled waveforms of summed (common mode) diagnostic potentials under normal and leakage-to-ground conditions. In FIG. 7, the vertical and horizontal axes are as explained in connection with FIG. 6 above. Under normal operating conditions, the summed diagnostic potential 210 ranges between plus and minus 5000 counts due to power line noise, but has approximately a zero count value when the power line (60 Hz) noise is averaged or filtered out. Under conditions of leakage, however, the average summed diagnostic potential 212 shifts back and forth between -3000 and + 3000 counts each time the polarity of the electromagnet drive changes. The summed diagnostic potential gives a detectable indication of electrode leakage.
- FIG. 8 illustrates a differential (flow) signal and a summed (common mode) electrode signal during a transition from normal to leaking conditions. The
vertical axis 200 represents electrode signal amplitudes expressed in normalized counts of an A/D converter in a digital sampling oscilloscope. Thehorizontal axis 202 represents elapsed time expressed as sample numbers. A leakage-to-ground condition is simulated by pouring water over a portion of one the electrodes that is external to the flow tube as shown attime 218. - In FIG. 8, a digitally sampled waveform of differential electrode signal under normal conditions is shown at 220 and under leakage-to-ground conditions is shown at 222. The change in this differential electrode signal, which represents flow, after the leak is about -21.62%. This amount of change is within the normal range of expected flow signals and thus cannot be distinguished from an actual change in flow rate, and can go undetected for a long period of time.
- A waveform of summed, also called common mode, electrode signal is displayed under normal conditions at 224 and under leakage to ground conditions at 226. The change in the common mode electrode signal when the leak is introduced is approximately 1000% which is easily distinguishable from normal operating conditions, and provides a good indication of leakage. These waveforms are obtained under test conditions of approximately 10 foot per second (3.05 metres per second) liquid flow rate and an approximately square wave electromagnet drive at a frequency of about 6 Hertz.
- FIG. 9 is a display image of digitally sampled waveforms of an uncorrected transmitter flow output signal under normal conditions at 230 and under leakage-to-ground conditions at 232. The uncorrected change or error in the flow output, after the leak is about -21.62%. The transmitter flow output shown at 230, 232 has not been automatically corrected based on the common mode signal.
- A waveform of summed, also called common mode, electrode signal is displayed under normal conditions at 234 and under leakage to ground conditions at 236. The change in the common mode electrode signal when the leak is introduced is approximately 1000% which is easily distinguishable from normal operating conditions, and provides a good indication of leakage.
- These waveforms are obtained under test conditions of approximately 10 foot per second (3.05 metres per second) liquid flow rate and an approximately square wave electromagnet drive at a frequency of about 6 Hertz.
- When automatic correction based on the common mode signal is used, the corrected flow output has an error of 0.12% before the leak is introduced as shown at 238, and the corrected flow output has an error of -1.77% after the leak is introduced. The automatic correction reduces the flow output error from -21.62% to only -1.77% in this particular test. Results will vary depending on the test conditions, however, generally a more accurate indication of flow is obtained under leakage conditions when the correction is made.
- FIG. 10 illustrates a
magnetic flow meter 250, utilizing aprocessor system 252 that combines the functions of the transmitter circuit and the diagnostic circuit. Theflow meter 250 is similar to theflow meters -
Processor system 252 includes aprocessor 254 andmemory 256. Adiagnostic algorithm 258 is stored inmemory 256. Theprocessor system 252 is coupled to acoil driver 152, and to first and second electrodes viaamplifiers digital converter 260. The processor system generates atransmitter output 154 representing a flow rate of liquid as a function of a differential potential between the first and second electrodes. The processor system senses a first diagnostic potential between the first electrode and ground, and also senses a second diagnostic potential between the second electrode and ground. The processor system generates adiagnostic output 164 indicating a presence of electrode leakage as a function of a sum of the first and second diagnostic potentials. The processor system, if desired, can correct the transmitter output as a function of the correction output using thediagnostic algorithm 258. - FIG. 11 illustrates the
diagnostic process 270 performed in theprocessor system 252 shown in FIG. 10. The process steps can be stored as adiagnostic algorithm 258 in theprocessor memory 256. The diagnostic algorithm can be stored in ROM, or if desired, the diagnostic algorithm can be stored in alterable memory such as EEPROM. The algorithm can be loaded in memory from a computer readable medium having stored thereon a plurality of sequences of instructions, the plurality of sequences of instructions including sequences which, when executed by a processor in a magnetic flow meter, cause the processor to perform the diagnostic sequence. - In FIG. 11, the
diagnostic algorithm 270 starts at 272. The sum of electrode voltages is calculated at 274. The resulting sum is then sampled at 276, preferably during a time interval when the magnetic field and electrode voltage are flat or stable. Next, an absolute value of the sampled sum is calculated at 278 to remove alternations in polarity. The absolute value is then compared at 280 to areference 282 to classify the leakage conditions. If the absolute value is low, then no leakage or malfunction is indicated as shown at 284. If the absolute value is approximately in the range of the normal flow signal, then leakage to ground is indicated at 286. If the absolute value is much large than normal flow signals, then leakage to an electromagnet coil is indicated at 288. - The leakage conditions including leakage or malfunction are output as shown at 290, and the transmitter output can be automatically corrected, if desired, as shown at 292. After completion of a diagnosis, the algorithm returns at 294 to the start to repeat the algorithm.
- Use of the
diagnostic algorithm 270 avoids a situation where the magnetic flow transmitter output appears to be indicating flow accurately, but actually is inaccurate due to undetected leakage in the electrode circuit. - Although the present invention has been described with reference to preferred embodiments, workers skilled in the art will recognize that changes may be made in form and detail without departing from the scope of the invention as defined by the claims.
Claims (11)
- A magnetic flow meter (20;120;180;250), comprising:a flowtube (22;50;92;124) having an electrically insulating liner (23;66;94) adapted to carry a flowing liquid (21;68;108;128) that is coupled to ground (130), said insulating liner (23, 66, 94) preventing electrical leakage from said liquid to the flowtube, the flowtube having an electromagnet (24;132), and an electrode circuit (146) including first and second electrodes (30,32;70,72;90;138,140);a transmitter circuit (34;152) coupled to the electromagnet, to the electrode circuit and to ground, the transmitter circuit being arranged to generate a transmitter output (154;196) representing a flow rate of the liquid as a function of a differential potential on the electrode circuit; and characterised bya diagnostic circuit (122;182) coupled to the electrode circuit and to ground, the diagnostic circuit being arranged to sense a first diagnostic potential between the first electrode and ground, and to sense a second diagnostic potential between the second electrode and ground, and arranged to generate a diagnostic output (164;198) indicating leakage from the electrode circuit as a function of the sum of the first and second diagnostic potentials.
- The magnetic flow meter of Claim 1 wherein the leakage is from the electrode circuit to ground and/or from the electrode circuit to the electromagnet.
- The magnetic flow meter of Claim 1 or Claim 2 wherein the diagnostic output indicates electrode-to-ground leakage when the sum of diagnostic potentials is in a first range (286), and indicates electrode-to-electromagnet leakage when the sum of diagnostic potentials is in a second range (288) larger than the first range.
- The magnetic flow meter of any of Claims 1 to 3 wherein the transmitter circuit is arranged to couple a drive output to the electromagnet, and the diagnostic circuit is arranged to calculate a sampled sum that is sampled in synchronization with the drive output.
- The magnetic flow meter of Claim 4 wherein the diagnostic circuit is arranged to calculate an absolute value of the sampled sum.
- The magnetic flow meter of any of Claims 1 to 5 wherein the transmitter circuit includes a correction circuit (184) for generating a corrected transmitter output as a function of the transmitter output and the diagnostic output.
- The magnetic flow meter of Claim 6 when dependent on claim 3 wherein the correction circuit is arranged to scale the corrected transmitter output as a function of a ratio of the diagnostic output to the transmitter output when the diagnostic output is in the first range.
- A computer readable medium having stored thereon a plurality of sequences of instructions, the plurality of sequences of instructions including sequences which, when executed by a processor in a magnetic flow meter (20;120;180;250), cause the processor to perform the sequence:receiving a first diagnostic potential between a first electrode (30;70;90;138) of a magnetic flow meter and ground (130);receiving a second diagnostic potential between a second electrode (32;72;140) of a magnetic flow meter and ground; andgenerating a diagnostic output (164;198) indicating a presence of electrode leakage as a function of the sum of the first and second diagnostic potentials.
- The computer readable medium of Claim 9, further having sequences of instructions that perform the following sequence:summing (274) the first and second diagnostic potentials;sampling (276) the sum of said first and second diagnostic potentials;calculating (278) an absolute value of said sum of said first and second diagnostic potentials;comparing (280) said absolute value to a stored reference value;indicating (290) electrode leakage as a function of the comparison between said absolute value and the stored reference value; andcorrecting (292) the transmitter output for the indicated leakage.
- A process for operating a magnetic flow transmitter (20;120;180;250), characterised by comprising:summing (274) first and second diagnostic potentials received from corresponding first and second electrodes (30,32;70,72;90;138,140) of a flowtube (22;50;92;124);sampling (276) the sum of said first and second diagnostic potentials;calculating (278) an absolute value of said sum of said first and second diagnostic potentials;comparing (280) the absolute value of said sum of said first and second diagnostic potentials to a stored reference value;indicating (290) electrode leakage as a function of the comparison between the absolute value of said sum of said first and second diagnostic potentials and the stored reference value; andcorrecting (292) the transmitter output for the indicated leakage.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US576719 | 1995-12-21 | ||
US09/576,719 US6611775B1 (en) | 1998-12-10 | 2000-05-23 | Electrode leakage diagnostics in a magnetic flow meter |
PCT/US2001/040782 WO2001090704A2 (en) | 2000-05-23 | 2001-05-22 | Electrical leakage diagnostics in a magnetic flow meter |
Publications (2)
Publication Number | Publication Date |
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EP1285237A2 EP1285237A2 (en) | 2003-02-26 |
EP1285237B1 true EP1285237B1 (en) | 2006-09-13 |
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ID=24305683
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP01944630A Expired - Lifetime EP1285237B1 (en) | 2000-05-23 | 2001-05-22 | Electrical leakage diagnostics in a magnetic flow meter |
Country Status (5)
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US (1) | US6611775B1 (en) |
EP (1) | EP1285237B1 (en) |
JP (1) | JP4593867B2 (en) |
DE (1) | DE60123044T2 (en) |
WO (1) | WO2001090704A2 (en) |
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US6611775B1 (en) | 1998-12-10 | 2003-08-26 | Rosemount Inc. | Electrode leakage diagnostics in a magnetic flow meter |
AU2002214332A1 (en) * | 2000-11-22 | 2002-06-03 | Mitsubishi Pharma Corporation | Ophthalmological preparations |
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- 2001-05-22 WO PCT/US2001/040782 patent/WO2001090704A2/en active IP Right Grant
- 2001-05-22 JP JP2001586424A patent/JP4593867B2/en not_active Expired - Fee Related
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102016115483A1 (en) | 2016-08-21 | 2018-02-22 | Krohne Messtechnik Gmbh | Method for operating a magnetic-inductive flowmeter and electromagnetic flowmeter |
EP3293499A1 (en) * | 2016-08-21 | 2018-03-14 | Krohne Messtechnik GmbH | Method of operating a magnetic-inductive flow meter and magnetic-inductive flow meter |
Also Published As
Publication number | Publication date |
---|---|
EP1285237A2 (en) | 2003-02-26 |
DE60123044D1 (en) | 2006-10-26 |
DE60123044T2 (en) | 2007-04-26 |
JP4593867B2 (en) | 2010-12-08 |
WO2001090704A3 (en) | 2002-05-30 |
US6611775B1 (en) | 2003-08-26 |
JP2003534543A (en) | 2003-11-18 |
WO2001090704A2 (en) | 2001-11-29 |
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